XII. 
ANNALES MUSEI NATIONALS HUNGARICL 
1914. 
FORMOSAN AGROMYZ1DÆ. 
By J. B. Malloch. 
(Plates IX-X.) 
The material upon which the present paper is based was collected in 
Formosa by Mr. Sauter and is now deposited in the Hungarian National 
Museum in Budapest. 
The most striking feature about the material is the very large number of 
species included in it, which belong to the group with black halteres, and 
the comparative scarcity of other forms. The species belonging to the group 
most numerously represented in this material are very similar in general 
appearance to those which occur in America as gall makers, or as root 
or stem miners. The absence of any species in the genus Agromyza, with the 
costa carried only to the end of the third vein, is also a feature, though 
this is probably due to the fact, that this group is, as elsewhere, rather less 
numerously represented than the others. 
While many of the Agromyza species included in this paper have 
much the habitus of some of those occurring in America and Europe, I have 
failed to identify satisfactorily any form but 'pusilla Meigen, which is 
possibly cosmopolitan and longipennis Loew. In the species variihalterata , 
we find a parallel to maculosa Mallo ch in the peculiar bicolored halteres, 
but there are many good characters by means of which they may be se¬ 
parated. 
There is no indication on any of the material as to the habits of the 
species. 
MILICHINAE. 
Pseudorhicnoessa, nov. gen. 
This genus may be separated from Rhicnoessa by the following cha¬ 
racters. The orbits have one strong backwardly-directed bristle at about 
the transverse line of the anterior ocellus, one strong outwardly-directed 
bristle much below this one, and one or two, much shorter bristles, between 
this point and the base of the antennæ ; the cruciate bristles on the center 
of the frons are represented by 2 or 8 pairs; the post-vertical bristles are 
strong and cruciate, otherwise the head is much as in Rhicnoessa. Thorax 
